Algebra 2 | Unit 4 | Lesson 7: Interpreting and Using Exponential Functions | Practice Problems

The half-life of carbon-14 is about 5,730 years. A tree fossil was estimated to have about 4.2 picograms of carbon-14 when it died. A picogram is a trillionth of a gram. The fossil now has about 0.5 picogram of carbon-14. About how many years ago did the tree die?

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CCSS.HSF.LE.A.4

Nickel-63 is a radioactive substance with a half-life of about 100 years. An artifact had 9.8 milligrams of nickel-63 when it was first measured. Write an equation to represent the mass of nickel-63, in milligrams, as a function of time.

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CCSS.HSF-IF.C.8B

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CCSS.HSF.LE.B.5

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CCSS.HSF.LE.A.2

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